Mark the `dumpwallet` RPC method as disabled.

Fixes #5513

doc/book/src/user/deprecation.md

@@ -69,3 +69,10 @@ The following features are disabled by default, and will be removed in release 5
   - `zcrawreceive` - The `zcrawreceive` RPC method is disabled.
   - `zcrawjoinsplit` - The `zcrawjoinsplit` RPC method is disabled.
   - `zcrawkeygen` - The `zcrawkeygen` RPC method is disabled.
+
+### Disabled in 5.0.1
+
+The following features are disabled by default, and will be removed in release 5.3.0.
+
+  - `dumpwallet` - The `dumpwallet` RPC method is disabled.
+

doc/release-notes.md

@@ -14,3 +14,14 @@ Option handling
   whenever the transaction does not contain Orchard components. This can be
   helpful if recipients of transactions are likely to be using legacy wallets
   that have not yet been upgraded to support parsing V5 transactions.
+
+Deprecated
+----------
+
+As of this release, the following previously deprecated features are disabled
+by default, but may be be reenabled using `-allowdeprecated=<feature>`.
+
+  - The `dumpwallet` RPC method is disabled. It may be reenabled with
+    `allowdeprecated=dumpwallet`. `dumpwallet` should not be used; it is
+    unsafe for backup purposes as it does not return any key information
+    for keys used to derive shielded addresses. Use `z_exportwallet` instead.

qa/rpc-tests/walletbackup.py

@@ -64,7 +64,12 @@ class WalletBackupTest(BitcoinTestFramework):
         ed2 = "-exportdir=" + self.options.tmpdir + "/node2"
 
         # nodes 1, 2,3 are spenders, let's give them a keypool=100
-        extra_args = [["-keypool=100", ed0], ["-keypool=100", ed1], ["-keypool=100", ed2], []]
+        extra_args = [
+            ["-keypool=100", ed0, "-allowdeprecated=dumpwallet"], 
+            ["-keypool=100", ed1, "-allowdeprecated=dumpwallet"], 
+            ["-keypool=100", ed2, "-allowdeprecated=dumpwallet"], 
+            []
+        ]
         self.nodes = start_nodes(self.num_nodes, self.options.tmpdir, extra_args)
         connect_nodes(self.nodes[0], 3)
         connect_nodes(self.nodes[1], 3)

src/deprecation.cpp

@@ -24,6 +24,7 @@ bool fEnableZCRawReceive = true;
 bool fEnableZCRawJoinSplit = true;
 bool fEnableZCRawKeygen = true;
 bool fEnableAddrTypeField = true;
+bool fEnableDumpWallet = true;
 #endif
 
 static const std::string CLIENT_VERSION_STR = FormatVersion(CLIENT_VERSION);
@@ -105,6 +106,7 @@ std::optional<std::string> SetAllowedDeprecatedFeaturesFromCLIArgs() {
     fEnableZCRawJoinSplit = allowdeprecated.count("zcrawjoinsplit") > 0;
     fEnableZCRawKeygen = allowdeprecated.count("zcrawkeygen") > 0;
     fEnableAddrTypeField = allowdeprecated.count("addrtype") > 0;
+    fEnableDumpWallet = allowdeprecated.count("dumpwallet") > 0;
 #endif
 
     return std::nullopt;

src/deprecation.h

@@ -38,9 +38,10 @@ static const std::set<std::string> DEFAULT_ALLOW_DEPRECATED{{
 }};
 static const std::set<std::string> DEFAULT_DENY_DEPRECATED{{
 #ifdef ENABLE_WALLET
+    "dumpwallet",
     "zcrawreceive",
     "zcrawjoinsplit",
-    "zcrawkeygen",
+    "zcrawkeygen"
 #endif
 }};
 
@@ -57,6 +58,7 @@ extern bool fEnableZCRawReceive;
 extern bool fEnableZCRawJoinSplit;
 extern bool fEnableZCRawKeygen;
 extern bool fEnableAddrTypeField;
+extern bool fEnableDumpWallet;
 #endif
 
 /**

src/wallet/rpcdump.cpp

@@ -549,6 +549,13 @@ UniValue dumpwallet(const UniValue& params, bool fHelp)
     if (!EnsureWalletIsAvailable(fHelp))
         return NullUniValue;
 
+    if (!fEnableDumpWallet)
+        throw runtime_error(
+            "dumpwallet is DEPRECATED and will be removed in a future release\n"
+            "\nUse z_exportwallet instead, or restart with `-allowdeprecated=dumpwallet`\n"
+            "if you require backward compatibility.\n"
+            "See https://zcash.github.io/zcash/user/deprecation.html for more information.");
+
     if (fHelp || params.size() != 1)
         throw runtime_error(
             "dumpwallet \"filename\"\n"